2020 Cadillac CT6 Problems: 5 Known Issues
2020 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated October 2026
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2020 Cadillac CT6 has 5 documented known issues, with 1 rated critical. The most serious is 10-Speed Transmission Damage Can Cause Wheel Lock-Up (Recall 25V148). Across all issues with published estimates, repair costs range from $150 to $1,500. DIY maintenance guides at au7o.io.
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All 5 Known Issues
NHTSA Recalls8 recalls
SEATS:MID/REAR ASSEMBLY
General Motors LLC (GM) is recalling certain 2016-2018 Cadillac CT6 vehicles. The inboard child seat anchorage bars may have had excess structural adhesive applied during assembly, which can interfere with the installation of a child seat. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 225, "Child Restraint Anchorage Systems."
SEAT BELTS:FRONT:WEBBING
General Motors LLC (GM) is recalling certain model year 2016 Cadillac CT6 vehicles manufactured July 21, 2016, to July 22, 2016. The bolt that connects the front passenger seat belt webbing to the seat's anchor plate may be missing. Without the bolt, the seat belt webbing may detach from the seat anchor.
EXTERIOR LIGHTING
General Motors, LLC (GM) is recalling certain 2016-2017 Cadillac CT6 vehicles. The Park/Position lights may be excessively bright. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 108, "Lamps, Reflective Devices, and Associated Equipment."
SEAT BELTS:REAR/OTHER
General Motors LLC (GM) is recalling certain 2018-2019 Cadillac CT6, Escalade ESV, Chevrolet Suburban, Volt, and GMC Yukon XL vehicles. Certain second-row or third-row rear seatbelts retractor assemblies may not automatically lock when the seatbelt is fully pulled out of the retractor, possibly preventing a child seat from being properly secured. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 208, "Occupant Crash Protection."
SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:ABS WARNING LIGHT
General Motors LLC (GM) is recalling certain 2019 Chevrolet Silverado 1500, Cadillac CT6, and GMC Sierra 1500 vehicles. Due to an Electronic Brake Control Module (EBCM) software error, the vehicle's Electronic Stability Control (ESC) and Antilock Brake System (ABS) may become disabled. Furthermore, if this specific error occurs, the vehicle's diagnostics will not illuminate the instrument cluster ESC and ABS malfunction warning lights. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 126, "Electronic Stability Control" and 135, "Light Vehicle Brake Systems."
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Frequently Asked Questions
What are the most common Cadillac CT6 problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2020 Cadillac CT6 has 5 documented issues. The most frequently reported are: 10-Speed Transmission Damage Can Cause Wheel Lock-Up (Recall 25V148), Parasitic Battery Drain From Keyless Entry Module Polling for Approach Lighting, Failed Thermostat Sets P0128, Forces Cooling Fans to Run Constantly and Disables the A/C. Of these, 1 is rated critical and should be addressed promptly.
Is the Cadillac CT6 reliable?
The 2020 Cadillac CT6 has 5 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: 10-Speed Transmission Damage Can Cause Wheel Lock-Up (Recall 25V148). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Cadillac CT6 problems?
Repair costs for known Cadillac CT6 issues range from $0 to $1,500, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2019-2020 Cadillac CT6 10-Speed Transmission Damage Can Cause Wheel Lock-Up (Recall 25V148)?
Certain 2019-2020 Cadillac CT6 vehicles equipped with a 10-speed transmission can develop internal transmission damage that may cause the wheels to lock while driving. Severity: high.
What is the 2016-2020 Cadillac CT6 Parasitic Battery Drain From Keyless Entry Module Polling for Approach Lighting?
CT6 owners report the 12-volt battery going flat after the car sits for a few days, sometimes flat enough that the electronic shifter and door handles will not respond and the car needs a jump. GM documents a cycling battery draw on 2016-2020 CT6 vehicles in preliminary informati… Repairs typically run $150-$900. Severity: medium.
What is the 2016-2020 Cadillac CT6 Failed Thermostat Sets P0128, Forces Cooling Fans to Run Constantly and Disables the A/C?
CT6 owners report the radiator cooling fans running at high speed all the time — including after shutdown — with the coolant temperature gauge reading cold, and in many cases weak heater output and the A/C refusing to engage. The root cause is a thermostat that fails stuck open. Repairs typically run $350-$800. Severity: medium.
What is the 2020 Cadillac CT6 Incorrect-Frequency TPMS Sensors on Dealer-Installed 20-Inch Wheels (Recall 19V731)?
GM recalled 2020 Cadillac CT6 sedans fitted with dealer-installed accessory 20 x 8.5-inch wheels (RPO 5JO or SHH) under NHTSA campaign 19V731. The tire pressure monitoring sensors mounted in those accessory wheels transmit on the wrong radio frequency, so the car's TPMS receiver… Repairs typically run $0-$0. Severity: medium.
What is the 2016-2020 Cadillac CT6 Rear Camera Mirror Module Failure — Blank, Blurry or Distorted Streaming Mirror Image?
The CT6's rear camera mirror streams a live video feed from a roof-mounted rear camera onto the mirror glass. Owners report the feed going blank, showing a grainy, pixelated or heavily distorted picture, or losing focus so badly at night and in rain that the mirror is unusable. G… Repairs typically run $400-$1,500. Severity: low.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.